> You said in a previous post that you execute... Wellllll... this is executed inside the generated `wrap_init()` which is part of the `Gtk::` namespace (in hindsight, a bad idea) and apparently this function is not getting called. If I call it directly in `main()` then things are working. At first, I thought there must be a `Gtk::wrap_init()` somewhere already in gtkmm but I can't find it, so the other possibility is maybe a build system error and a left over build artifact somewhere. Maybe? In any case, to summarize, my understanding is that:
1. I used _CLASS_GOBJECT which generates a Glib::wrap returning a `Glib::RefPtr` instead of _CLASS_GTKOBJECT which generates Glib::wrap returning a raw pointer. This may or may not have contributed to the particular problem, as perhaps some type/overload resolution somewhere depended on this. Or it was a latent error that wasn't involved in this particular problem. 2. Lacking a `wrap_init`, I was not calling `Glib::wrap_register`, which sounds like the most likely culprit 3. Even after I generated `wrap_init()`, it apparently wasn't getting called. Possibly due to some link-order issue or a stale build artifact or something. > Perhaps you can double-check that Glade and GtkBuilder really give you a GtkPanZoomArea, and not just a GtkDrawingArea This is a bit moot now, but since you asked I will answer: I'm pretty confident that the `GtkPanZoomArea` was getting constructed. It uses some custom signals for `area-motion`, `area-button` and `area-draw`. Those signals and their default handlers (virtual functions) were both working in a demo application. If it were actually constructing a drawing area I would expect that connecting those signals would error. Lastly, I spent the morning pushing the library containing this widget to github to help with the discussion. It's not relevant anymore but since I posted it I'll go ahead and share the links. * Here is the header for GtkPanZoomArea (source nextdoor): https://github.com/cheshirekow/tangent-gtk/blob/master/tangent/gtkutil/panzoomarea.h * Here is panzoomarea.hg: https://github.com/cheshirekow/tangent-gtk/blob/master/tangent/gtkutil/mm/panzoomarea.hg Given this learning experience I'll probably do some reorganization/refactoring to improve the mm- wrapping situation. Thank very much, Kjell, for your help. I think this problem is solved. On Mon, May 4, 2020 at 4:30 AM Kjell Ahlstedt <kjellahlst...@gmail.com> wrote: > On 2020-05-03 20:12, Josh Bialkowski wrote: > > Ok, I think I figured it out the m4 include path issue for gmmproc, but I > still can't load the widget from GtkBuilder even when using > `_CLASS_GTKOBJECT`. I think that with two `-I` in the command line, one > must be overriding the other. The following command line seems to work, and > generates a reasonable .h file. > > ~~~ > M4PATH=/usr/lib/x86_64-linux-gnu/glibmm-2.4/proc/m4:/usr/lib/x86_64-linux-gnu/atkmm-1.6/proc/m4:/usr/lib/x86_64-linux-gnu/pangomm-1.4/proc/m4 > /usr/lib/x86_64-linux-gnu/glibmm-2.4/proc/gmmproc -I > /usr/lib/x86_64-linux-gnu/gtkmm-3.0/proc/m4 panzoomarea mm mm > ~~~ > > I should have realized that gmmproc must be able to find atkmm's and > pangomm's m4 files. They are included from convert_gtkmm.m4. gmmproc > usually works well if all its input is correct, but it's not always good at > telling what's wrong when some input is wrong or missing. > > So, now we're back at your first question: Why does the dynamic_cast to > Gtk::PanZoomArea* fail? > > You said in a previous post that you execute > > Glib::wrap_register(gtk_panzoom_area_get_type(), > &PanZoomArea_Class::wrap_new); > > That's necessary. Still it looks like Glib::wrap_auto() and > Glib::wrap_create_new_wrapper() wrap a GtkPanZoomArea in a > Gtk::DrawingArea. I don't understand why. > > Perhaps you can double-check that Glade and GtkBuilder really give you a > GtkPanZoomArea, and not just a GtkDrawingArea. You've said that > > GtkPanZoomArea* panzoom_ = > GTK_PANZOOM_AREA(builder->get_object("overhead-view")->gobj()); > > works. I don't know if GTK_PANZOOM_AREA() checks the type, or if it just > casts unconditionally. >
_______________________________________________ gtkmm-list mailing list gtkmm-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtkmm-list
